How check Bootloader status in Xiaomi phones

Download Necessary Tools

1. Xiaomi PC Suite

2. Drivers and Adb with Fastboot tools

Installing Necessary Tools

1. First install Xiaomi PC Suite

2. Next install Adb mini with fastboot tools setup to get all necesary drivers and programs.

• Windows 10 users should additionaly go to c:\Windows\inf  and search file "wpdmtp.inf" press right button on it and  select INSTALL

Check Bootloader Status Tutorial

1. Turn off phone completly.
2. Hold Vol Down and Power Button 
3. Release both keys as soon as the Fastboot Mode pops up
4. Connect Xiaomi phone by usb cable to computer.
5. Turn on Command Prompt from start menu with admin right(if windows ask about rights just press YES)
6. If you not change default directory ADB and FASTBOOT files are in C:\ADB
7. Need go to this directory by command:

• type cd\ and press enter button.
• type cd adb and press enter button.

Next enter fastboot command:
1. Type fastboot devices
and press enter key
This command check communication with phone and sure that all drivers are installed correcly.

2. Type fastboot oem device-info 
and press enter key
This command give all necessary information what we should know. If we have locked bootloader or unlocked.

You should got info like on picture mean:

(bootloader)    Device tampered: false
This mean phone is ok and working normaly without any software problem

(bootloader)    Device unlocked: false
This mean bootloader is LOCKED 

(bootloader)    Device unlocked: true
This mean bootloader is UNLOCKED 

Other Usefull Fastboot Command in Xiaomi phones:
1. fastboot reboot
This command is used to reboot phone from fastboot mode to normal use.

2. fasboot oem lock
This command is used to LOCK Bootloader from UNLOCK state if needed.

3. fastboot reboot-edl
This command is used to reboot phone from fastboot mode to EDL MODE
(only older phone supported MIUI 7 and older).